definition of unsafe though. If the classes are being taught in the nest but there is no "penetration" as far as into the cave itself, just used as a glorified anchor line coming down to the mound where the diver is still provided essentially a straight shot up to the surface, is that more or less unsafe than trying to go out on a boat where the diver is inexperienced with rough seas and constantly changing conditions?
Is Eagles Nest more predictable than the ocean? Yes
Is it more dangerous than the ocean? Maybe, but if it is only being used as reliable access to 130' with easy conditions, I truly believe that it is safer than doing it in the ocean. Is this a dangerous cave? hell yeah, is a dive profile where you descent to the mount to hit 130', stay there for 10 minutes with direct access to the surface during the day with a full cave instructor really that dangerous? Not in my opinion. I think this would be a very different discussion if it was a different cave that was less "scary".
As I stated in a solo thread recently, safe is not up to peers to decide, safety during training is the risk tolerance of the:
1. Instructor
2. Training Agency
3. Insurance company
If the instructor thinks it's too risky, with knowledge of the student, their capabilities, site, and potential for bad things to happen with the site, they will obviously choose to change something in the equation, namely, the student or the site.
As Jim has pointed out, the agency certainly has the right to declare certain activities as too risky. TDI will issue a waiver to certain instructors or teams to perform OW dives at EN for training. That may be too risky for NACD or NSS-CDS to condone, but really? Calling an instructor out who has the waiver and understands the risk?
The insurance company certainly has a say. We offer solo diving because our insurance company has said it's OK within certain limits. But oh, holy cow, lots of folks dive solo without a card. It's within their personal tolerance for risk.
When my wife took her full cave course back in the stone age, her instructor discussed solo cave diving. He did not condone or condemn solo cave diving, he outlined the risks and told each student that acceptance of those risks was up to them. She doesn't solo cave dive, but she is not morally opposed to it either.
So really, a bunch of yahoos getting on here and berating someone for having more tolerance for risk is a lot like berating someone for driving faster than they would. It's BS, and has no place. If you want to change the rules, by all means, do so by doing what NSS-CDS did, spell them out and follow them. Otherwise, it's just a bunch of useless noise.